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Which of the following is wrong?

1. NH3 < PH3 < AsH3 — Acidic
2. Li < Be < B < C — First IP
3. Al2O3 < MgO < Na2O < K2O — Basic
4. Li+ < Na+ < K+ < Cs+ — Ionic radius

Correct answer: Al2O3 < MgO < Na2O < K2O — Basic

Solution

The basicity of oxides increases down the group and from right to left in a period. However, Al2O3 is amphoteric, not less basic than MgO, making this statement incorrect.

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